5 ways to celebrate National Cheeseburger Day this Sunday

Another food holiday, you say? Hear us out: National Cheeseburger Day is something we should be especially interested in, namely because the cheeseburger was actually invented in Pasadena. Lionel Sternberger slapped a piece of cheese on top of a patty between 1924 and 1926 while he was working at his father's shop, the Rite Spot, and the rest is cheesy history. To celebrate, a handful of restaurants around town are offering discounted (and even free!) cheeseburgers on Sunday the 18th. Check 'em out:

Dog Haus: Visit any Dog Haus location on Sunday and you can upgrade your cheeseburger for free. That means a second patty and an extra slice of cheese (normally a $2 upgrade) on your regular burger—come hungry.

The Melt: The early bird gets the worm at any Melt location this Sunday, when the first 100 people in line for dinner (starting at 5pm) will receive a free original cheeseburger. Can't make it in time for the freebie? Snap a photo of your purchased cheeseburger from September 18-30 and, using the hashtags #themelt and #burgerlicious, you'll be entered to win a $50 gift card or cheeseburgers for a year.

K Ramen. Burger. Beer: Snag 50% off a K Burger on Sunday at this Glendale eatery; the behemoth meal includes 1/2-pound of beef, caramelized onions, tomato, American cheese and Chef's Spicy Creamy Sauce, plus a side of fries or tots.

Pono Burger: Head to Pono Burger in Santa Monica, Venice or West Hollywood for a top-secret Posh Burger, available all day on Sunday. The $10 burger (normally $13) features organic beef, Castello Danish blue cheese, house-made truffle aioli, sautéed mushrooms and organic arugula.

Napa Valley Grille: Dubbed "The Westwood Juicy Lucy," Napa Valley Grille is offering an exclusive burger available on National Cheeseburger Day. The Lucy is stuffed with Monterey Jack Cheese, fried shallots, tomato, arugula and charred Serrano ketchup, and will be served with Truffled Tater Tots.